Based on UIS and RS,a quantitative research on soil erosion in Taiyuan City is undertaken by RUSLE.The paper analyses the impact factors of soil erosion.At last,a new classification of soil erosion in Taiyuan City is put forward.The results show that most part of Taiyuan City are dominated by little or slight erosion,which is mainly distributed in the forest area in the middle and southern regions and in the arable land such as terrace